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Effects of petroleum on adrenocortical activity and on hepatic naphthalene-metabolizing activity in mallard ducks

Archives of Environmental Contamination and Toxicology

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Abstract

Unstressed mallard ducks (Anas platyrhychos), given uncontaminated food and maintained on a short photoperiod, show two daily maxima in plasma corticosterone concentration ([B]); one occurring early in the light phase and a second just before the onset of darkness. After one week of exposure to food containing 3% (v/w) South Louisiana crude oil, plasma [B] were significantly lowered throughout the day. Similar abrupt declines in plasma [B] also occurred during the first 10 days of exposure to food containing 1% and 0.5% crude oil. Although the plasma [B] in birds consuming food contaminated with 0.5% crude oil increased between 10 and 50 days of exposure, the concentration after 50 days was still lower than normal. During the same interval, normal plasma [B] were restored in birds consuming food containing 1% and 3% crude oil. Significant increases occurred in the naphthalene-metabolizing properties of hepatic microsomes prepared from birds acutely exposed to all levels of petroleum-contaminated food and elevated levels were sustained throughout the first 50 days of exposure. Birds given food containing 3% crude oil for more than 50 days, however, showed steady declines in hepatic naphthalene-metabolizing activity. After 500 days, the activity was similar to that found in contemporaneous controls. During the same interval, the plasma [B] increased until the levels were higher than normal after 500 days of exposure; at this time, an inverse relationship, similar to that seen during the first week of exposure to contaminated food, was once more established between plasma [B] and the concomitant hepatic naphthalene-metabolizing activity.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Effects of petroleum on adrenocortical activity and on hepatic naphthalene-metabolizing activity in mallard ducks
Series title:
Archives of Environmental Contamination and Toxicology
Volume
10
Issue:
6
Year Published:
1981
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
765-777
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
765
Last page:
777
Number of Pages:
13